App concurrency is spiking- has anything changed in the infrastructure?

[MatthewIngwersen]

Hi @andig, we recently lifted some idle timeout restrictions on TCP connections in our proxy. There’s a lot more information about that here:

TCP idle timeouts restrictions have been removed

We’ve removed our idle timeout detection → closing mechanism for TCP connections. It used to serve as a way to detect not-fully-closed-but-dropped connections. Instead, we have properly setup various socket options w/ the kernel to shutdown connections in CLOSE_WAIT or FIN_WAIT states. For the vast majority of our users, this will be a positive change: long-lived connections won’t be closed anymore when there’s no read/write activity happening on them. This is particularly useful for database c…